Reverse Time Axis Domain in Perspective Time Series Chart

A client of mine requested that the time axis on our charts run reverse from the default, as in the most up-to-date times appear on the left side of the graph.
I've had success with this in vision and the reporting module, but I don't know where this could be done in Perspective. The documentation doesn't reference anything like it, so I thought I'd see if anyone had a guess on how to do it.